我要跟tdd打个招呼。我想调用事件byText，但我无法执行此操作，因为我在组件中收到此错误。

TypeError: Cannot read property 'getByText' of undefined

这是我的组件：

const createSubject = props => {
    render(
      <AnnoucementItem
        {...defaultProps}
        {...props}
      />
    );
  };

这是我的测试文件：

import React from 'react';
import { render,fireEvent } from 'react-native-testing-library';
import Enzyme,{ shallow } from 'enzyme';
import { useDispatch } from 'react-redux';

import i18n from '../../../../src/i18n';
import AnnoucementItem from '../../../../src/screens/Profile/AnnouncementList/AnnouncementItem';

jest.mock('react-redux');

let { onEdit,toggleVisibility,onDelete } = jest.fn();

describe('<AnnoucementItem />',() => {

  const defaultProps = {
    navigation: {},item: {
      id: 'annoucement id',user_id: 'id do usuario',is_published: true,images: {
        0: {
          secure_url: genericurl',},address: {
        city: 'pelotas',state: 'RS',number: '990',street: 'Rua Doutor Francisco Ferreira Veloso',neighbourhood: 'Py Crespo',values: {
        other: '4.32',total: '4422.33',positive_ratings: '2',negative_ratings: '1',onEdit: onEdit,toggleVisibility: toggleVisibility,onDelete: onDelete,toggleVisibility: () => {},onDelete: () => {},onEdit: () => {},numberOfLikes: 3,SwitchOption: {
      switchValue: false,userId: () => {},isFetching: () => {},shouldUpdate: () => {},userAnnouncements: () => {},formVisibility: () => {},error: () => {},fetchUserAnnouncements: () => {},deleteAnnouncement: () => {},fillFormAnnouncement: () => {},changeAnnouncementVisibility: () => {},};

  const createSubject = props => {
    render(
      <AnnoucementItem
        {...defaultProps}
        {...props}
      />
    );
  };

  describe('AnnoucementItem component',() => {
    it('should delete annoucement',() => {
      const { getByText,getByTextId } = createSubject();

      fireEvent.CallDelete(getByTextId('DeleteButton'),'deleteAnnouncement');
      fireEvent.press(getByText(i18n.t('profile.announcementList.announcementItem.deleteAnnouncementAlert')));

      const {
        requestDeleteAnnouncement,successDeleteAnnouncement,announcementId,} = jest.fn();

      useDispatch.mockReturnValue(
        requestDeleteAnnouncement,announcementId);

      expect(AnnoucementItem.prototype.onDelete.calledOnce).toBe(true);

      expect(requestDeleteAnnouncement).toHaveBeenCalledWith({
        actionTypes: 'REQUEST_DELETE_ANNOUNCEMENT',});
      expect(successDeleteAnnouncement).toHaveBeenCalledWith({
        actionTypes: 'SUCCESS_DELETE_ANNOUNCEMENT',dispatch: { deletedId: announcementId },});
    });
  });

  it('should go to edit annoucement',() => {
    const { getByText,getByTextId } = createSubject();

    fireEvent.CallEdit(getByTextId('EditButton'),'EditAnnouncement');
    fireEvent.press(getByText(i18n.t('profile.announcementList.announcementItem.editAnnouncement')));

    const editAnnouncement = jest.fn();
    const navigation = { navigate: jest.fn() };

    useDispatch.mockReturnValue(editAnnouncement);
    expect(editAnnouncement).toHaveBeenCalledWith({
      navigation: { navigation },});
  });

  it('should count interested peoples in my annoucement',item } = createSubject();

    const interested = getByText(item.positive_ratings + item.negative_ratings);

    expect(interested).toBeTruthy();
  });

  it('should switch visibleAnnoucement',() => {

  });
});

问题是，如何获取元素ByText？